Piston for internal-combustion engines



2' Sheets- /////////Iln,

Walter H. Living g.

w. H. LIVINGOOD I PISTON FOR INTERNAL COMBUSTION ENGINES March 17, 1925.

v/. 4 fl T v m v w HZ W. N m 1 a 1 m March 1 7, 1925. 1,530,383

W. H. LIVINGOOD v PISTON FOR INTERNAL COMBUSTION ENGINES Filed Sept. 8,1922 2 Sheets-Sheet 2 a :IIIZIII r 33 34 W VVdlter H. Livinyood.

ATTORNEY 'Patented -M ar'. 1"], 1925.

UNITED STATES PATENT OFFICE.

WALTER HQLIV'INGOOD, or BERKELEY, camronnm.

rrsrron FOR mrnmmn comsusrron ENGINES.

Application filed September 8, 1922. Serial No-.-587,030.

To all whom it may concern:

Be it known that I, WALTER HILIvI'nsoon, a citizen of the United'States,residing.

at Berkeley, in the county of Alameda and State of California, haveinventednew and useful Improvements in Pistons for Internal-CombustionEngines, of which the fol-.

lowing is a specification.

This invention relates to pistons for internal combustion engines, theprimary object being to provide a novel structure of a piston by the useof which the renewal of the upper iston ring or ringsmay be readilyefi'ec-te A further object of this invention is to provide a piston ofsimple design such as v j willensure an extremely lightweight structure.

A still further object of this invention is the provision of asectionally constructed piston particularly adapted for internalcombustion motors which provides means for effectively locking the capor upper portion of a; sectional lston structure, means for preventingthe iateral displacement of the wrist pin, anda series of ports oropenings in' the walls thereof whereby lightness in weight is ensured. V

With the foregoing and other objects in view as will be later on moreapparent,

my invention consists essentially in the novel features of construction,combination and arrangement of'parts hereinafter articular-' 1ydescribed and more specifical y defined by the appended claims.

In the further disclosure of the invention reference is to be had totheacoompanylng sheets of explanatory drawings constituting a part of thisspecification and in which like characters of reference designate thesame or corresponding parts in all the views.

. Figure 1is a side elevation of a sectional piston for internalcombustion engines 'as and,

Figure 6is a cross section taken substantially on the line 5 -5 inFigure 5, and looking in thedirection of the arrows.

. Referring more particularly to the drawings the numeral 10 indicatesthe main or body portion of the piston and 11 the screw cap thereofwhich may be readily removed for the replacin of a worn ring and againreplaced by appiy the rectangular slot 12 which is provided in the topface of said screw capll, said screw cap 11 belng also internallythreaded and adapted to register with a corresponding thread 13 on theshouldered portion 14 of the main piston portion 10.

In securing the'screw cap 11 on the body ing an appropriate tool to v Iportion 10 the top groove 15 adapted'for the reception of a piston ringis formed by the extendmg flanges 16 and 17. Directly below the flange17 on the .piston portion 10 are four or more projecting lugs 18 whichact as guides or supports for a suitable packing. such as asbestos cordpacking which is wound about the body portion intervening the lugs 18and the flange 17 as indicated by the dotted lines 19 in F1 res 1 and 3,said packing 19 being inten' ed to revent an undue amount of oil fromworking its way into the combustion area, or past the first piston ring.

Peripherally central with the wrist pin 20 1s an extra large orm'ainpiston ring 21 which encloses the apertures 22, provided for the wristpin 20 and prevents any lateral displacement of said wrist pin 20.

The undercut portion 23, 24 immediately above and below the main ring 21is substantially of a T section 25 with a series of apertures or openmgs26, permitting ample cylinder wall lubrication and reducing the weightof the piston to a minimum.

Referring more particularly to the looking means for preventing theannular screw cap or cover 11 from workin loose while in operation, Idrill through 51c cap 11 and part way into the peripheral face of theshoulder portion 14 and thread the aperture thus formed in screw cap 11and shoulder portion to receive threaded locking pin 27, oralternatively I may employ the locking means illustrated in Figures 5and 6. The locking means shown by Figures 5 and 6 consist of a lockingspring ring or member 28, adapted to seat in an annular groove 29located on the inner periphery of the annular screw cap 11, said groove29 being provided with an inwardly projecting stop 30 which providesabutting means for the aforesaid locking spring ring or band member 28,which is provided With an inwardly bent extending portion or tongue 31for engagement in the notches or teeth 32 formed on a co -operatinglocking member 33 consisting of a flat metal strip which is c0rru gatedor formed with a plurality of teeth or notches 32, said metal strip orlocking member 33 being adapted to seat in a groove or slot 34 rovidedfor the same. This co-operating ocking member 33 is rigidly secured inthe slot or groove 34 by inserting the free ends 35 thereof through anaperture or slot 36 at ri ht angles with the groove or slot 34, said iree ends 35 extending through said aperture or slot 36 and being turnedover or clinched on the face of the inner periphery of the main pistonbody portion 10.

From the foregoing description it will be,

apparent that when a renewal of the upper or top piston ring or rings isdesired, it is only necessary to remove the uppermost portion orscrewcap 11, leaving the lower or main portion of the piston 10 intacton the connecting rod of an internal combustion motor and it will beobserved that my novel sectional piston structure is provided withinternal locking means preventing the upper and lower sections which areinter-connected by a screw thread from working loose or turning on thescrew thread.

While there has been shown and described a preferred embodiment of myinas fairly fall within the scope of the appended claims.

Having described my invention, what I claim as new and desire to secureby Letters Patent, is:-

1. In a piston for internal combustion engines the combination of a mainbody portion having diametrically opposed elongated peripheral aperturesin reduced parts of the wall thereof, a grooved medial portion for thereception of a piston ring, journals in the medial portion for awrist-pin the outer ends whereof are closed in by the piston ring,outset lugs for supporting the packing ring in spaced relation relativeto the piston ring, a removable cap for the piston, and means forlocking said cap securely on the body portion.

2. In a piston for internal combustion engines the combination of a mainbody portion having diametrically opposed elongated peripheral aperturesin reduced parts of the wall thereof, a grooved medial portion for thereception of a piston ring, journals in the medial ortion for awrist-pin the outer ends Whereoi are closed in by the piston ring,outset lugs and an annular flange near the head of the piston forsupporting a packing ring in spaced relation relative to the pistonring, a removable cap for the piston, and means for locking said capsecurely on the body portion.

In testimony whereof I atlix my signature.

mar

Witness to mark:

A. F. HAR'I'MAN.

